CN1163543C - Polypropylene-base resin composition and products of injection molding thereof - Google Patents

Polypropylene-base resin composition and products of injection molding thereof Download PDF

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Publication number
CN1163543C
CN1163543C CNB99801768XA CN99801768A CN1163543C CN 1163543 C CN1163543 C CN 1163543C CN B99801768X A CNB99801768X A CN B99801768XA CN 99801768 A CN99801768 A CN 99801768A CN 1163543 C CN1163543 C CN 1163543C
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propylene
weight
ethylene
alfon
block copolymer
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CN1287565A (en
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贞利甫
����һ
大川健一
神崎进
岩井久幸
野村孝夫
市川彰一
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Sumitomo Chemical Co Ltd
Toyota Motor Corp
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Sumitomo Chemical Co Ltd
Toyota Motor Corp
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F297/00—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
    • C08F297/06—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the coordination type
    • C08F297/08—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the coordination type polymerising mono-olefins
    • C08F297/083—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the coordination type polymerising mono-olefins the monomers being ethylene or propylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

A polypropylene-base resin composition which comprises a polypropylene resin (A) consisting of a propylene/ethylene block copolymer comprising a propylene homopolymer segment and a propylene/ethylene random copolymer segment and a propylene homopolymer, an ethylene/1-octene copolymer rubber (B), and talc (C) having a mean particle diameter of 3 um or below; and products of injection molding of the composition.

Description

Polypropenyl resin composition and injection-molded item thereof
Technical field
The present invention relates to polypropylene resin composite and injection-molded item thereof.The invention particularly relates to and aspect physicals, have excellent rigidity and shock resistance, have to have as current mark neither occurring aspect short injection cycle and the surface quality at the injection moulding aspect of performance and also welded bonds can not occur, also can not produce the polypropylene resin composite and the injection-molded item thereof of features such as surface strains.More particularly, the present invention relates to specific acrylic resin is main component, and contain specific ethene-1-octene copolymer rubber components and talcous, polypropylene resin composite with aforesaid superior physical properties and injection moulding performance, and relate to by the injection-molded item with excellent in dimension stability of injection moulding by the said composition injection molded, relate in particular to Injection moulded part as automobile exterior spare (as collision bumper etc.).
Technical background
Recently, for weight reduction, consideration such as reduce cost, extensively adopted propylene-ethylene block copolymer as the material of making automobile exterior spare.
Yet, the shock strength of propylene-ethylene block copolymer is very low, thereby, advised propylene-ethylene block copolymer and ethylene-propylene copolymer rubber or ethene-blend mutually such as 1-octene copolymer rubber as Japanese patent application JP-A-53-22552, JP-A-6-192500, JP-A-6-248156, JP-A-6-192506 and JP-A-53-40045 for improving its shock strength.But, when with ethylene-propylene copolymer rubber, ethene-blend such as 1-octene copolymer rubber, though ballistic intensity has had raising, and thermal characteristics (temperature that distorts as heat etc.) and rigidity have descended, and this is a defective to the material as manufacturing automobile exterior spare.
In order to address this problem, in above-mentioned composition, sneaked into mineral filler such as lime carbonate, barium sulfate, mica, crystallization Calucium Silicate powder, talcum etc. again as what propose among Japanese patent application JP-A-51-136735, JP-A-53-64256, JP-A-53-64257, JP-A-57-55952, JP-A-57-207630, JP-A-58-17139, JP-A-58-111846, JP-A-59-98157, the JP-B-55-3374 etc.
Yet, the conventional material system that contains propylene-ethylene block copolymer/ethylene-propylene copolymer rubber or ethene-1-octene copolymer rubber/mineral filler is not because the injection moulding performance reaches and requires and can not take into account shock strength and rigidity property and still can not be as the material of automobile exterior spare.
Content disclosed by the invention
At above-mentioned situation, the object of the present invention is to provide and a kind ofly can take into account shock strength and rigidity property well and have excellent injection moulding the performance polypropylene resin composite and the Injection moulded part thereof of (as current mark etc. not occurring).
The present inventor has been found that by adopting mainly to contain acrylic resin and be added with a kind of specific rubber components by the specified composition ratio can be met the polypropylene resin composite and the injection-molded item thereof of above-mentioned requirements, thereby can reach purpose of the present invention.That is to say that the present invention relates to a kind of polypropylene resin composite, said composition comprises:
(1) acrylic resin formed by following polymers (i) and mixture (ii) of 55-75 (weight) % (A):
(i) comprise as first segmental alfon part with as second segmental propylene-ethylene random copolymers propylene-ethylene block copolymer partly,
(ii) limiting viscosity [η] P is 0.08-0.18m 3/ kg (in 135 ℃, 1,2,3, measure in the 4-naphthane) alfon;
(2) 21-30 (weight) % (B) melt flow rate (MFR) is the ethene-1-octene copolymer rubber of 2-10 gram/10 minutes (pressing JIS-K-6758,190 ℃ of mensuration), and wherein 1-octene components contents is 20-25 (weight) %;
(3) 5-20 (weight) % (C) median size be not more than 3 microns talcum powder wherein, the content sum of component (A), (B), (C) is no more than 100 weight %,
Wherein in the acrylic resin (A) the second segment content in the propylene-ethylene block copolymer be expressed as (A) ', ethene-1-octene copolymer rubber content be expressed as (B) ' time, satisfy the following relationship formula:
0.10≤{(A)′/[(A)′+(B)′]}≤0.30
When above-mentioned composition is at least 400% by ASTM D638, elongation limit when standing tension test for 23 ℃, the melt flow rate (MFR) of composition (press JIS-K-6758,230 ℃ of mensuration) is at least 30 grams/10 minutes, and above-mentioned polypropylene resin composite also can make Injection moulded part by injection moulding; And
Wherein alfon is 90-60 weight % with the ratio of propylene-ethylene block copolymer (i) (ii) in the acrylic resin (A): 10-40 weight %, and condition is (i)+(ii)=100 weight %; With
Wherein the content of propylene-ethylene random copolymers part is that 5-30 weight % and propylene-ethylene random copolymers ethylene content partly are 25-55 weight % in the propylene-ethylene block copolymer (i).
The detailed description of the invention is as follows.
In the present invention, acrylic resin (A) is meant the acrylic resin that mainly comprises aforesaid propylene-ethylene block copolymer (i) and aforesaid propylene homopolymer polymeric blends (ii); Wherein comprise in the propylene-ethylene block copolymer (i) as first segmental alfon part with as the second segmental propylene-ethylene random copolymers part; Alfon limiting viscosity [η] P (ii) is 0.08-0.18m 3/ kg (in 1,2,3,4-tetralin, measuring) in 135 ℃.(i) and amount ratio (ii) be generally (ii): (i) the arbitrary ratio between 90-60 (weight) %: 10-40 (weight) %, condition are (i)+(ii)=100 (weight) %.
The Q value of acrylic resin of the present invention (A) (weight-average molecular weight (Mw)/number-average molecular weight (Mn), represent molecular weight distribution) be according to gel permeation chromatography (GPC) result of the alfon in the acrylic resin (A) part and definite, be preferably 3.0-5.0, more preferably 3.5-4.5.When the Q value was lower than 3.0, then flowing property degenerated, when the Q value surpass 5.0 the time, can not obtain taking into account the best result of rigidity property and impact property in some cases.
In this article, the alfon in the acrylic resin (A) partly is the first segment part that had both referred in the propylene-ethylene block copolymer (i), also refers to alfon (ii).
Alfon in the acrylic resin (A) particularly preferred physicals and composition etc. (ii) is as follows:
The Q value is preferably 3.0-5.0,3.5-4.5 more preferably, in addition, by 13The isotaxy five unit number of componentss that C-NMR calculates are at least 0.97, preferably are at least 0.98.When isotaxy five unit number of componentss are lower than 0.97, just be difficult to reach performances such as desired rigidity and thermotolerance in some cases.
In addition, at 135 ℃, the limiting viscosity of measuring in 1,2,3,4-tetralin [η] P is 0.08-0.18m 3/ kg is preferably 0.09-0.16m 3/ kg.P is lower than 0.08m when limiting viscosity [η] 3During/kg, shock strength is low, can not obtain best physicals.And, when limiting viscosity surpasses 0.18m 3During/kg, flowing property degenerates.
For comprising as first segmental alfon part with as the propylene-ethylene block copolymer (i) in the acrylic resin (A) of second segmental propylene-ethylene random copolymers part, particularly preferred physicals, composition etc. are as follows:
In propylene-ethylene block copolymer (i), identical with aforesaid propylene homopolymer physicals (ii) as the physicals of first segmental alfon part.Be that the Q value is 3.0-5.0, be preferably 3.5-4.5, 13C-NMR calculate isotaxy five unit number of componentss be at least 0.97, be preferably at least 0.98.In addition, at 135 ℃, the limiting viscosity of measuring in 1,2,3,4-tetralin [η] P is 0.08-0.18m 3/ kg is preferably 0.09-0.16m 3/ kg.
Can obtain in the polymerization reactor after the first step prepares the alfon polyreaction partly of segmented copolymer (i) as first segmental alfon part in the propylene-ethylene block copolymer (i), the alfon of taking-up just can be measured its [η] P.
As the content of second segmental propylene-ethylene random copolymers part in propylene-ethylene block copolymer (i) is 5-30 (weight) %, is preferably 10-20 (weight) %.
Ethylene content [(C2 ') EP] in the propylene-ethylene random copolymers part is preferably 25-55 (weight) %, more preferably 30-50 (weight) %.When ethylene content was lower than 25 (weight) % or surpasses 55 (weight) %, in some cases, the shock resistance of said composition can not be best.Limiting viscosity [η] EP of propylene-ethylene random copolymers part is preferably 0.25-0.60m 3/ kg, more preferably 0.30-0.60m 3/ kg.When limiting viscosity is lower than 0.25m 3During/kg, can not obtain taking into account the optimum of rigidity property and impact property in some cases.In addition, surpass 0.60m when limiting viscosity 3During/kg, the granular texture part can be produced, thereby the high optimum of surface quality can not be obtained in some cases.
Be illustrated at this measuring method above-mentioned all physicalies.Isotaxy five unit number of componentss are meant the mark that is present in the propylene monomer units in five unit, isotactic chain center, in other words, just be meant according to people such as A.Zambelli in " macromole (Macro molecules) ", 6, method described in 925 (1973) is promptly used 13The mark of the propylene monomer units of the sequential cells of five meso bondings of formation in the polypropylene molecular chain that the C-NMR method is measured.Yet the ownership of NMR absorption peak is according to Macromolecules, and method described in 8,687 (1975) is determined.
Specifically, isotaxy five unit number of componentss are bases 13The mmmm peak accounts for that the area fraction of total absorption peak determines in the methyl carbon zone in the C-NMR spectrum.According to this method, the isotaxy five unit number of componentss that record the NPL reference material CRM No.M19-14 polypropylene PP/MWD/2 of Britain NATIONAL PHYSICAL LABORATORY are 0.944.
In propylene-ethylene block copolymer (i), the numerical value of the propylene-ethylene random copolymers part crystallization melting heat that shared weight ratio X can be by measuring alfon part and whole segmented copolymer respectively in whole segmented copolymer, determine through following Equation for Calculating:
X＝1-(ΔHf)T/(ΔHf)P
In the formula: (Δ Hf) T and (Δ Hf) P represent as follows respectively:
(Δ Hf) T: the melting heat of whole segmented copolymer (card/gram);
(Δ Hf) P: the melting heat (card/gram) of alfon part.
In addition, ethylene content can be after recording the weight percentage of ethene in the whole segmented copolymer by infrared spectroscopy in the propylene-ethylene random copolymers, calculates and determine through following equation:
(C2′)EP＝(C2′)T/X
In the formula: (C2 ') T and (C2 ') EP represent as follows respectively:
(C2 ') T: the ethylene content in the whole segmented copolymer (weight %);
(C2 ') EP: ethylene content (weight %) in the propylene-ethylene random copolymers part.
In addition, in propylene-ethylene block copolymer (i), the limiting viscosity [η] of propylene-ethylene random copolymers part at EP (at 135 ℃, in 1,2,3, measure in the 4-tetraline) can be by measuring the limiting viscosity of homopolymer part and whole segmented copolymer respectively, through following equation calculating and determine.
[η]EP＝[η]T/X-(1/X-1)[η]P
In the formula: [η] P and [η] T represent as follows respectively:
[η] P: the limiting viscosity (m of alfon part 3/ kg);
[η] T: the limiting viscosity (m of whole segmented copolymer 3/ kg).
Be used for propylene-ethylene block copolymer of the present invention and be a kind of in the presence of stereoregulated polymerization catalyzer for example, the product that makes the propylene polymerization preparation preparation of propylene and ethylene copolymer be obtained as second segmental propylene-ethylene random copolymers part as first segmental crystalline propylene homopolymer part, say so from the strict sense a kind of first segment and the second segmental composition.
Above-mentioned segmented copolymer can make by known method such as slurry polymerization process, gas phase polymer etc.
Ethene-1-octene copolymer rubber (B) restrains/10 minutes 190 ℃ melt flow rate (MFR) (MFR) for 2-10.When 190 ℃ MFR surpassed 10 grams in the time of/10 minutes, can not obtain best shock strength performance, and be lower than 2 grams in the time of/10 minutes as 190 ℃ MFR, its dispersiveness in polypropylene (A) can be very poor, can't obtain the shock strength performance of the best.
1-octene components contents is 20-25 (weight) % in ethene-1-octene copolymer rubber (B).When 1-octene components contents is lower than 20 (weight) %, can not obtain best impact resistance, and when 1-octene components contents surpasses 25 (weight) %, can not obtain best rigidity property, and because the degenerating the current mark that produced of mobile and other performance and the outward appearance of moulded parts is produced injurious effects.
The density of ethene-1-octene copolymer rubber (B) is that 0.860-0.875 gram/cubic centimetre is preferred, when density is lower than 0.860 gram/cubic centimetre, in some cases, can not obtain best rigidity property.On the other hand, when density surpasses 0.875 gram/cubic centimetre, can not obtain best impact resistance in some cases.
Aforesaid ethene-1-octene copolymer rubber (B) can make ethene and 1-octene copolymer make in inert organic solvents (as hydrocarbon) by adopting the Ziegler-Natta catalyst system that is made up of vanadium compound, organo-aluminium compound and halogenated ester cpds.In addition, ethene-1-octene copolymer rubber also can be by adopting aikyiaiurnirsoxan beta and known Metallocenic compound (titanium, zirconium or hafnium are coordinate in Metallocenic compound) compound catalyzer mutually, be so-called metalloscene catalyst, make ethene and 1-octene copolymer and make.
The talcous median size that is adopted among the present invention is not more than 3 microns.When talcous median size surpassed 3 microns, shock strength can reduce greatly, and outward appearance such as gloss etc. also can degenerate.Can adopt the talcum powder of unprocessed mistake, yet the talcum powder of handling through various known surface treatment agents such as silane coupling agent, titanium coupling agent, higher fatty acid, high-grade aliphatic ester, high fatty acid amide, higher fatty acid salt or other tensio-active agent can be used to improve with the interface adhesivity of acrylic resin and improves its dispersiveness.
Herein, talcous median size is meant and adopts centrifugal settling type particle size distribution measurement device, measure talcum powder in dispersion medium such as water, alcohol etc. suspension and the determined 50 percent mean particle dia D50 of sieve laxative remedy integral distribution curve that obtains.
In the present invention, final product composition having should satisfy following expression, in the propylene-ethylene block copolymer of acrylic resin (A) the second segment content (weight %) be expressed as (A) ', ethene-1-octene copolymer rubber content (weight %) be expressed as (B) ' time, then
0.10≤{(A)′/[(A)′+(B)′]}≤0.30
When above-mentioned expression less than or during greater than listed two numerical ranges, can not obtain best shock strength performance.
The tensile elongation of polypropylene resin composite of the present invention is at least 400%.When tensile elongation is lower than 400%, brittle rupture takes place easily, and can not make best automobile exterior injection-molded item.
The melt flow rate (MFR) (MFR) of polypropylene resin composite of the present invention in the time of 230 ℃ is at least 30 grams/10 minutes, and when MFR was lower than 30 grams/10 minutes the time, then flowing property is very poor, thereby injection moulding adds trade union and becomes very difficult.
The density of polypropylene resin composite of the present invention is preferably 0.95-1.05 gram/cubic centimetre.When this density is below or above this numerical range, can not obtain the automobile exterior mouldings of optimum shape in some cases.
In order to satisfy above-mentioned physicals, reply Q value, isotaxy five unit number of componentss, [η] P, (C2 ') EP, [η] EP etc. do suitable adjustment.
Can adopt and mediate machinery as device fabrication present compositions such as single screw extrusion machine, twin screw extruder, Banbury, hot-rollings.Each component can be mixed or one by one mix simultaneously.As addition means one by one, for example have acrylic resin (A) is mixed with talcum powder (C), add the method for ethene-1-octene copolymer rubber (B) then, and talcum powder (C) is pre-mixed into the high density masterbatch with acrylic resin (A), when mediating, use acrylic resin (A) and method that ethene-1-octene copolymer rubber (B) dilutes then respectively.In addition, as the second method of adding one by one, also can adopt crystalline polypropylene (A) and ethene-1-octene copolymer rubber (B) are mediated, the method of adding talcum powder (C) then and mediating, and high concentration ethylene-1-octene copolymer rubber is kneaded into masterbatch with polypropylene (A) in advance, and then add polypropylene (A) and talcum powder (C), and the method that they are kneaded together.As the third method of adding one by one, as polypropylene (A) is mediated with talcum powder (C) in advance, another part polypropylene (A) is mediated with ethene-1-octene copolymer rubber (B) in advance, two kinds of methods that mixture is kneaded together that will obtain at last.The required temperature of kneading process is 170 °-250 ℃, and the kneading time is 1-20 minute.
In addition, in above-mentioned kneader, also can suitably add additive such as antioxidant, uv-absorbing agent, lubricant, pigment, static inhibitor as required, copper staining prevents agent, fire retardant, neutralizing agent, whipping agent, softening agent, nucleator, defoamer, linking agent etc. to main ingredient.
Polypropylene resin composite of the present invention can be configured as the Injection moulded part with above-mentioned physicals by the method for injection moulding commonly used.Specifically, described Injection moulded part is suitable for and makes the automobile exterior moulded products.
Implement preferred plan of the present invention
The present invention will be described in more detail to utilize following embodiment; Yet the present invention is not subjected to these
The restriction of embodiment.
In an embodiment, the method for mensuration physicals is described as follows:
(1) melt flow rate (MFR)
Carrying out melt flow rate (MFR) according to the method for JIS-K-6758 defined measures; Except as otherwise noted, this mensuration process is that 230 ℃, load are to carry out under 2.16 kilograms of conditions in temperature all.
(2) flexure test
Method according to the JIS-K-7203 defined is carried out flexure test; Test is to adopt injection moulding to be shaped with sample, and the thickness of sample is 6.4 millimeters, and modulus in flexure (FM) and flexural strength (FS) are to be that 100 millimeters, loading rate are to measure under the condition of 2.0 mm/min in the length of span, and the mensuration temperature is 23 ℃.
(3) cantilever-type impact strength (IZOD)
Carrying out shock strength according to the method for JIS-K-7110 defined measures; Test is to adopt injection moulding to be shaped with sample, and the thickness of sample is 6.4 millimeters, measures sample gap after injection moulding of shock strength, and measuring temperature is-30 ℃.
(4) tension test
Method according to ASTM D638 defined is carried out tension test; Test is to adopt injection moulding to be shaped with sample, and the thickness of sample is 3.2 millimeters, and elongation limit (UE) is to measure under the 50 mm/min conditions in rate of extension, and measuring temperature is 23 ℃.
(5) current mark
Detect by an unaided eye the tiger fur shape striped that occurs on 100 * 400 * 3 millimeters the injection moulding flat board degree and with zero (outward appearance is good) or * (appearance poor) judge.
(6) ethylene content and propylene content
Ethylene content or propylene content are by the preparation compressing tablet, measure the infrared absorption spectrum of this compressing tablet, utilize the methyl group (CH that occurs in the spectrum spectrogram that obtains 3) and methylene group (CH 2-) the absorbancy of characteristic absorbance, by calibration curve method and definite.
(7) limiting viscosity
Adopt determination of ubbelohde viscometer three concentration 1.0,2.0 and 5.0kg/m 3Reduced viscosity, by at " Kobunshi Yoeki; Kobunshi Jikkengaku 11 " (KyoritsuShuppan Kabushiki Kaisha, 1982 publish), computing method described in 491 pages is determined limiting viscosity, promptly use extrapotation, concentration is mapped, the viscosity number when curve extrapolation is arrived zero-dose with reduced viscosity.For acrylic resin, the employing 1,2,3,4-tetralin is solvent, carry out viscosimetric analysis under 135 ℃.
(8) molecular weight distribution (Q value)
Molecular weight distribution is under following condition, measures by gel permeation chromatography (GPC):
GPC: model: 150C, Waters Company makes,
Chromatographic column: two Shodex 80MA posts, Showa Denko K.K. makes,
Sample size: 300 microlitres (polymer concentration: 0.2 (weight) %),
Flow rate: 1 ml/min
Temperature: 135 ℃
Solvent: neighbour-dichlorobenzene
The polystyrene standard that adopts TOSOH CORP to make is made efflux volume and molecular weight calibration curve, utilize this calibration curve can measure the contrast weight-average molecular weight and the number-average molecular weight of polystyrene-sample, Q value { weight-average molecular weight (Mw)/number-average molecular weight (Mn) } then can be used as measuring of molecular weight distribution.
The sample that is used for assessing physicals in above-mentioned (2), (3) and (4) prepares under following injecting condition: composition in hot air drying cabinet in 120 ℃ of dryings 2 hours, injection moulding under 220 ℃ of injection temperatures then, 50 ℃ of mold cools down temperature, 15 seconds injection times and cooling time 30 seconds; Adopt Toshiba Machine Co., the IS150E-V type injection moulding machine that Ltd. makes.
In addition, the following composition of preparation under following condition:
By the Henschel mixing machine with roll mixed machine, in advance two kinds of components of acrylic resin (A) in the listed component of table 3 are mixed equably, then other component in acrylic resin (A) and the table 3 is placed Bitruder (model: FEX44SS 30BW-2V, THE JAPANSTEEL WORKS, LTD. mixing and extrusion molding manufacturing) (extrusion molding speed is 30 kilograms/hour under the exhaust suction condition, screw speed is that per minute 900 changes) are made composition.
Point out that in passing the regulation of shorthand notation is as follows in the table:
BC: propylene-ethylene block copolymer,
PP: alfon,
EBR: ethene-butene-1 copolymer rubber,
EOR: ethene-1-octene copolymer rubber,
The P part: alfon part among the BC,
EP part: propylene-ethylene random copolymers part among the BC.
Embodiment 1
Under specified requirements, with 20 (weight) part propylene-ethylene block copolymer (BC), 44 (weight) part alfon (PP), 24 (weight) part ethene-1-octene copolymer rubber (EOR) and 12 (weight) part median size is that 2.5 microns talcum powder is mediated, and makes test sample by the polypropylene resin composite that obtains through injection moulding.The physicals of various materials is listed in table 1 and the table 2, and the ratio of each component is listed in the table 3 and the physicals that records is listed in the table 4 in the composition.{ (A)/[(A) '+(B) '] } numerical value is 0.22 to the formula of the polypropylene resin composite of present embodiment.
Comparative examples 1
Except that ethene-1-octene copolymer rubber is listed in EOR-2 in the table 2 replaces, all the other are handled by the method identical with embodiment 1.The measurement result of physicals is listed in the table 4.The numerical value of the formula of the polypropylene resin composite of present embodiment { (A) '/[(A) '+(B) '] } is 0.22.
Comparative examples 2
Except that ethene-1-octene copolymer rubber is listed in EBR-1 in the table 2 replaces, all the other are handled by the method identical with embodiment 1.The measurement result of physicals is listed in the table 4.The value of the formula of the polypropylene resin composite of present embodiment { (A) '/[(A) '+(B) '] } is 0.22.
Comparative examples 3
Remove the EBR-2 that ethene-1-octene copolymer rubber is listed in the table 2 and replace, the addition of EBR-2 is changed into 30 (weight) especially simultaneously, and all the other are handled by the method identical with embodiment 1.The measurement result of physicals is listed in the table 4.The value of the formula of the polypropylene resin composite of present embodiment { (A) '/[(A) '+(B) '] } is 0.18.
Compare with comparative examples, the flowing property of the embodiment of the invention is good, current mark do not occur, and has between excellent cantilever-type impact strength and tensile elongation and two performances and also can finely take into account.
Table 1
Sample The P part The EP part
Q value [η] P mmmm (dl/g) [η] EP content 1 content 2 (dl/g) is (wt.%) (wt.%)
BC 4.0 1.3 0.98 3.0 33 37
PP 4.0 0.9 0.98 - - -
BC: propylene-ethylene block copolymer,
PP: alfon,
The P part: alfon part or entire PP among the BC,
The EP part: propylene-ethylene random copolymers part among the BC,
The content of EP part among the content 1:BC,
The ethylene content of content 2:EP part,
Mmmm: isotaxy five unit number of componentss.
Table 2
Sample MFR measures 190 ℃ of temperature (g/10min) Co-monomer content (wt.%)
EBR-1 2 17
EBR-2 7 23
EOR-1 5 24
EOR-2 1 23
EBR-1 and 2: ethene-butene-1 copolymer rubber,
EOR-1 and 2: ethene-1-octene copolymer rubber,
Table 3
Component (wt.%)
BC PP EOR-1 EOR-2 EBR-1 EBR-2 Talcum powder
Embodiment 1 20 44 24 12
Comparative examples 1 20 44 24 12
Comparative examples 2 20 44 24 12
Comparative examples 3 20 38 30 12
Table 4
MFR FM FS IZOD (-30℃) UE Current mark
Embodiment 1 38.4 14500 252 5.0 ＞500 ○
Comparative examples 1 28.4 14200 249 6.2 ＞500 ×
Comparative examples 2 26.0 14100 258 4.3 430 ×
Comparative examples 3 41.0 14700 258 4.4 164 ○
MFR: melt flow rate (MFR) (restraining/10 minutes), measuring temperature is 230 ℃,
FM: modulus in flexure (kilogram/square centimeter),
FS: flexural strength (kilogram/square centimeter),
UE: elongation limit (%),
Current mark: zero: good, *: poor.
Industrial applicibility
Polypropylene resin composite according to the present invention has excellent rigidity and impact strength and excellent injection moulding performance and mobile performance, and its Injection moulded part has good outward appearance. Polypropylene resin composite according to the present invention is applicable to the manufacturing of Injection moulded part, particularly utilizes above-mentioned physical property to be applicable to the manufacturing of automobile exterior moulding.

Claims (8)

1. polypropylene resin composite, said composition comprises:
(1) acrylic resin formed by following polymers (i) and mixture (ii) of 55-75 weight % (A):
(i) comprise as first segmental alfon part with as second segmental propylene-ethylene random copolymers propylene-ethylene block copolymer partly,
Be 0.08-0.18m (ii) in 135 ℃, limiting viscosity [η] P that in 1,2,3,4-tetralin, measures 3The alfon of/kg;
(2) 21-30 weight % (B) melt flow rate (MFR) is pressed JIS-K-6758, is determined as ethene-1-octene copolymer rubber of/10 minutes of 2-10 gram at 190 ℃, and wherein 1-octene components contents is 20-25 weight %;
(3) 5-20 weight % (C) median size is not more than 3 microns talcum powder, and wherein, the content sum of component (A), (B), (C) is no more than 100 weight %,
Wherein in the acrylic resin (A) the second segment content in the propylene-ethylene block copolymer be expressed as (A) ', ethene-1-octene copolymer rubber content be expressed as (B) ' time, satisfy the following relationship formula:
0.10≤{ (A) '/[(A) '+(B) '] }≤0.30 when above-mentioned composition press ASTM D638, during 23 ℃ of drawns tests, elongation limit is at least 400%, the melt flow rate (MFR) of composition by JIS-K-6758,230 ℃ be determined as at least 30 the gram/10 minutes; And
Wherein alfon is 90-60 weight %:10-40 weight % with the ratio of propylene-ethylene block copolymer (i) (ii) in the acrylic resin (A), and condition is (i)+(ii)=100 weight %; With
Wherein the content of propylene-ethylene random copolymers part is that 5-30 weight % and propylene-ethylene random copolymers ethylene content partly are 25-55 weight % in the propylene-ethylene block copolymer (i).
2. according to the polypropylene resin composite of claim 1, wherein in the acrylic resin (A) as the ratio Q value of the weight-average molecular weight of first segmental alfon part in the propylene-ethylene block copolymer (i) and number-average molecular weight and the alfon Q value (ii) 3.0-5.0 that respectively does for oneself.
3. according to the polypropylene resin composite of claim 1, wherein press as the isotaxy five unit number of componentss and the alfon isotaxy five unit number of componentss (ii) of first segmental alfon part in the propylene-ethylene block copolymer (i) in the acrylic resin (A) 13C-NMR calculates and respectively does for oneself at least 0.97.
4. according to the polypropylene resin composite of claim 1, wherein the part of the propylene-ethylene random copolymers in the propylene-ethylene block copolymer (i) is 0.25-0.60m at 135 ℃, limiting viscosity [η] EP that measures in 1,2,3,4-tetralin 3/ kg, described limiting viscosity by measuring described homopolymer part and whole segmented copolymer respectively limiting viscosity and decide through following equation calculating:
[η]EP＝[η]T/X-(1/X-1)[η]P
In the formula, [η] P represents the limiting viscosity of alfon part, and unit is m 3/ kg; [η] T represents the limiting viscosity of whole segmented copolymer, and unit is m 3/ kg.
5. according to the polypropylene resin composite of claim 1, the density of therein ethylene-1-octene copolymer rubber (B) is 0.860-0.875 gram/cubic centimetre.
6. according to the polypropylene resin composite of claim 1, wherein the density of polypropylene resin composite is 0.95-1.05 gram/cubic centimetre.
7. an Injection moulded part is characterized in that this product is to obtain by the polypropylene resin composite of injection moulding according to claim 1.
8. according to the Injection moulded part of claim 7, wherein Injection moulded part is an automobile exterior spare.
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